[PATCH] drm: fix i_mapping and f_mapping initialization in drm_open in error path

[Marco Munderloh]

> Attached is a v2 of the patch, for reference. I would appreciate if the original reporter or you tested it in lieu of your proposed patch and let me know if it fixes your
> issue.

The patch works for me. echo 3 > /proc/sys/vm/drop_caches as well as rmmod radeon do not end up in a crash anymore. However, I have still no clue why one of these makes 
drm_open to fail. On rmmod radeon I get the following log messages. If don't know if the 'unpin not necessary' has anything to do with it.

[drm] radeon: finishing device.
radeon 0000:01:00.0: ffff88024e526c00 unpin not necessary
radeon 0000:01:00.0: ffff88024f2f6000 unpin not necessary
radeon 0000:01:00.0: ffff88024f2f6000 unpin not necessary
[TTM] Finalizing pool allocator
[TTM] Finalizing DMA pool allocator
[TTM] Zone  kernel: Used memory at exit: 0 kiB
[TTM] Zone   dma32: Used memory at exit: 0 kiB
[drm] radeon: ttm finalized
vga_switcheroo: disabled
[drm] Module unloaded

By the way, sometimes my r8169 ethernet controller does not survive suspend/hibernation (does not detect link). rmmod/modprobe helps. I don't know if this is related.

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